<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>button</title>
</head>

<body>
  <div id="like_button_container"></div>
  <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/babel-standalone@6/babel.js"></script>

  <script>
    'use strict';

    const e = React.createElement;

    // 继承  react.Component 组件
    class LikeButton extends React.Component {
      constructor(props) {
        super(props);
        this.state = {
          liked: false
        };
      }

      render() {
        if (this.state.liked) {
          return 'You liked this.';
        }

        return e(
          'button', {
          onClick: () => this.setState({
            liked: true
          })
        },
          'Like'
        );
      }
    }
    const domContainer = document.querySelector('#like_button_container');
    ReactDOM.render(e(LikeButton), domContainer);
  </script>
</body>

</html>